*
   * This method may only be invoked by the writer thread. There may be only thread invoking this
   * method at a time.
   */
  @Throws(IOException::class)
  internal fun writeOneFrame(): Boolean {
    val writer: WebSocketWriter?
    val pong: ByteString?
    var messageOrClose: Any? = null
    var receivedCloseCode = -1
    var receivedCloseReason: String? = null
    var sendOnClosed = false